Mat'Selesnya, Parun

Convoke, indestructible
Other spells you cast have convoke.
When Mat'Selesnya, Parun enters the battlefield, you gain X life, draw X cards and creatures you control get +X/+X until end of turn, where X is the number of creatures you control.
Mat'Selesnya's power and toughness are each equal to the number of creatures you control.